Flexible stay-bolt.



' inrrsn HARVEY A. PIKE, OF NEW YORK,

FLEXIBLE STAY-BGLT.

Specification of Letters l axtent.

. ted Jan 142, 1808.

Application iilerl October lG- 190i), ficriml No. 339,223

To all whom it may concern:

Beit known that l, HARVEY PIKE, a l are heated by the citizen. of the United States, and a resident of New York city, New York, have invented certain Improvements in Flexible Stav- Bolts, of which the following i: :1. specificstion.

and minimum cost, as Well as one that is simple in its construction and mode of operetionl My invention is fully shown in the accompanying drawings, in which: Figure 1, is a. sectional view of a stay-bolt embodying my invention, fitted in place, such view being taken on the line ao, Fig. 2 Fig. 2 is a sec: tional plan view taken on the line bb, Fig-l 1, and Figs. 3, 4, 5 and 6, are sectional views simih r to the upper part of Fig. 1, illustrating modifications 6ll1l)( (l lng my invention.

As is well. known, stay-bolts are employed for the purpose of securingand staying the sheets of steam boilers; their function being to provide proper and suilicient resistance to the exertion 01 internal pressure.

.In the drnwings,.1 represents the plate forming one wall of 'eboiler-shell into which is tapped a sleeve-plop suitably threaded for the purpose, said sleeve-plug having an internal sent 3 for the head 4, of :1 bob 5, and being internally threaded at (l. The bolt is centrally bored for a short distance, as shown at 7, for a purpose to be described. Fitting the internally threaded portion {5 of the plug H, to the lower Sl8V6-])lll" 2, is another is secured, and this port of \vhirh a tube 9 tube is adapted to enter the control bore 7 of the bolt. The lower part ol the opening in the plug 8 is contracted, and the upper end of said tube 9 is expanded into the some by g means of a screw-plug l0, threaded into said plug 8; said bored at 1] n1 plug 10 being also centrally line with the bore of the tube 9, and these parts are shown in their zissembled position in Fig. l. The opposite end of the bolt 5 is tlreeded into the plate 1 iorming the other well of the boiler-shell, the projecting portion of the some being riveted down as shown in the lower port of Fig. l. v The tube 9 is of llratO-lltll that will expand as a. greater degreetlmn the motel oi the l 1 l I l l l l l I bolt,

soon. the ports generated Within the tightly the Wall of the bore 7 within said bolt 5; I prefer to use copper the metcriallor this tube, although it will be understood that other metals may be used without de mrting lrom my inven- W hen the parts are nssen'ihled, e1

and consequrmtly boiler, such tube hugs non. leakage of stezuu post the seat for the honheed within the sleeve-plug will be stopped by the tube 9 as it will be pocketed in the space between the her d of the bolt and plug rerr vingr said tubular member.

in practice the expansion of the sheil of the boiler, due to the nest and pressure within the some, will tend to distort snid shell, but this is compensated for by the bulhnndsocket joint between the hood of the bolt and the seat .l tor the some i'ormed in the sleeveplug 2. Should the pressure within the boiler be so great {is to ell'ect sullh-icnt distortion to break the bolt ud ieccnt hood, the stcznn will iind its outlet through the tube ll within said bolt and the openings in the ernl plugs in line the with i prel'er to l'orio the heed the boltof the shape shown in Fig.v i; ls' e' substinstinlly the some as a rivet heed, .ss material will he required and such struct 2ft; easier to make and linish.

in Fig. 33 l. have shown at modiiied form of structure mnhodying my invention, in which lv cnlhloy 2i flexible metallic Washer 15. The bolt is substantially thev some ns that illustrated in Fig. 1, except ihotits up end is provided with u fi l" .lcd ltl the bob tom; the bore 7 oxtcnd i wrcl'rozn. The wan-she! rests on l-z lgrc nathin the shu /ophng so, the bust: of its intcrnrlly thrcmlcd portion, and has n senirul lunged portion 16 to enter the rcecs in the bend ol the bolt, such llungr being i-ngnged bf, o. plug 1 threaded into said bolt rel-res. A plug lils the internally tin-ended portion 5 of the slows-plug L. and serve-s :5: u gourd for said internal plug 11')" holding; the wnshcrin place. Both of the plugs 8 nod 10'' are centrally bored in line with the central bore of the bolt.

lo the structure shown in Fig. 4, lvw'o-flexh blc lnelellie washers 15 are employed, each having outwnrdly extending central flanges lo, and betwemi these flanges d spherical member 10* is mounted. A 'plug'l is pro-- ided for engegenwnt with th ieeve-plug .2;

sand plug having it 1' internally threaded porti I seat for the same.

v The bolt is alsoprovided with a semi-circular .flange of the upper washer overlying said spherical member, and upon the continued movement of said plug, the flanges of said washers will be pressed by the engagement of the several'parts into close contact with said spherical member.

In lieu of havin the sleeve plug with an on 6 for the reception of a screw-plu as shown in Figs. 1, 3 and 4, such internal threads may be omitted and the external threads of said sleeve-plug extend the entire length of the same, as indicated in Figs. 5 and 6; cap-plugs being employed wit the same for confining the several parts of the structure in place.

In Fig. 5, I have shown a structure embodying my invention which is substantially like that shown in Fig. 1, except that a capplug 8 is employed instead of the screwplug 8. The parts are otherwise the same. In the structure shown in Fig. 6, however, the head 4 of the bolt is substantially spherical in shape and the shoulders of said head rest in a suitable seat 3 formed within a screw plug 2 which is slightly different than those shown in the other figures. The position of the seat may be changed and formed at any desirable point within such sleeve-plug, the essential point being to provide for movement between the head of the bolt and the In this particular instance, the head of the bolt projects above the sleeve-plug and a semi-circular cap-plug 8 is employed therewith, engaging the upper portion of the threads of said sleeve-plug.-

The bolt is bored centrally in the same manner as indicatedin the structures shown in the other figures, and the cap-plu is also bored in line therewith. Disposed within the bore of the bolt is a tubular member 9, which in this instance has a semi-eircular cap-like portion 20, disposed between the bolt-head and the cap-plug 8 and having a flanged portion 21 lying between the top of the sleeve-plug and an internal shoulder of the cap-plug. This tubular member serves the same purpose as those indicated in the other views.

In all instances the purpose of my invention is to provide a connection for the head of the belt that will germit movement; to provide means for tray ping any steam jvhat may pass the seat of bolt, such means being of a flexible character so as to avoid interference with any movement that maybe imparted to the bolt or its head due to stresses or strains within the boiler shell, andat the same time to insurp that anybreakageof the bolt due to excessive strain and internal pressure will immediateIypermit the escape of steam. Q

I claim: a

1. A stay-bolt structure, comprising the usual bolt, a sleeve-plug fitting the plate of a boiler-shell and having a seat for said. bolthead, said bolt havinga central bore, means carried by the sleeve-plug for normally re- 7 taining said-bolt in place, and a flexible connecting member between saidretaining means and the bolt.

2. A stay-bolt structure, comprising a bolt having the usual threaded end and a head at the opposite end, a sleeve plug fitting the plate of a boiler-shell and having a seat for said bolt-head, said bolt having a central bore, means carried by the sleeve-plug for normally retaining said bolt in place, said means having an aperture communicating with the bore of the bolt, and a flexible connecting member between said retaining means and the bolt.

3. A stay-bolt structure, comprising the usual bolt, a sleeve-plug fittin the boilershell and having a seat for the liead of said belt, a separate threaded member engaging bolt in place, and a flexible connecting memsaid sleeve-plug for normally retaining the berbetween said retaining members and the bolt.

4. A stay-bolt structure, comprising a bolt suitably secured at one end to one portion of a boiler-shell and having a head at the other end of the same, a sleeve- )lug fittingthe other shell and having a seat or the head of said bolt, a separate.threaded member engaging said sleeve-plug for normally retain ing the bolt in place, and a flexible connecting member between said retaining member and the bolt.

5. A stay-bolt structure, comprising the usual bolt, a sleeve-plug fitting the boiler shell and having a seat for the head of said bolt, said bolt being centrally bored, an independent plug engaging said sleeve-plug.

for normally retaining the bolt in place, and a tube extending from said retaining plug and entering the bore of the bolt.

6. A stay-bolt structure, comprising a bolt suitably secured at one end to one portion of a boiler-shell and having a head at the other end of the same, a sleeve-plug fitting the other shell and having a seat for the head oi said bolt, said bolt being centrally bored, an

independent plug engaging said sleeve-plug l'or normally retaining the bolt in lace, said inde cndent plug having a centra bore, and a tulle extending from said retaining plug and entering the bore of the bolt.

7. A stay-bolt structure, comprising the usual bolt, a sleeve-plug fitting the boilershell and having a seat for the-head of said bolt, said bolt. being centrally bored, an independent plug fitting said sleeve-plug for normally retaining said bolt in place, a tube extending from said independent retaining plug and entering the bore of the bolt, and means for securing the upper end of said tube in said independent plug.

8. A stay-bolt structure, comprising a bolt suitably secured to one portion of a boilershell and having a head at the other end of the same, a sleeve-plug fitting the other shell and having a seat for the head of said bolt, said bolt being centrally bored, an independent plug fitting said sleeve-plug for normally retaining said bolt in place, a tube extending from said independent retaining plug and entering the bore of the bolt, and a centrally bored screw-plug for securing the upper end of said tube in said independent plug.

9. A stay-bolt structure, com prising a headed bolt, a sleeve-plug tapped into "the boiler-shell and having a seat for the head of said bolt, said bolt being bored, a plug fitting the interior of the sleeve-plug, and a tubefitting the bore of the bolt and havingits outer end confined by the plug fitting the sleevelug. p 10. A stay-bolt 'tructure, comprising a headed bolt, a sleeve-plug ta ped intothe boiler shell and having a seat or the head of said bolt, said bolt being bored, a supplemental plug fitting the interior of the sleeve plug,

a flexible tube fitting Within said here and having its outer end extending into said supplemental plug, and means for confining said end thereto.

11. A stay-bolt structure, comprising a sleeve-plug tapped into the boiler-shell and having an internal seat, a bolt having a head adapted to said seat, retaining means for the sleeve plug serving tohold thebolt in position, and a flexible closing member between said bolt and said retaining means.

12. A stay-bolt s' ructure, comprising a sleeve-plug tapped into the boiler-sheli and having an internal seat, a bolt having a head adapted to fit said. seat, a supplemental plug fitting Within the sleeve-plug and serving to retain the bolt in place, and a flexible member forming a joint between said supplemental plug and said bolt, said plug being apertured and communicating with the interior of said flexible joint forming means.

In testimony whereot, I have signed my name to this specification, in the presence of two subscribing Witnesses.

HARVEY A. PIKE.

\Vitnesses MURRAY 0. Borne, Jos. H. KLEIN. 

